STAMFORD -- The three-day trial of a former Greenwich High School teaching aide accused of sexual misconduct with a 10-year-old boy ended Wednesday with Andrew Knapp taking the stand in his own defense.

Under questioning by his attorney, Rob Serafinowicz, Knapp denied approaching the youngster in the nude in a shower stall in the locker room following a swimming lesson at the Greenwich Boys & Girls Club and asking the boy to soap his back.

The boy, now 15, took the stand Monday and told the jury of four women and two men that during January and early February 2010, Knapp walked into his shower stall on four or five occasions and asked the youngster to soap his back. The youth, who was composed during questioning by Assistant State's Attorney Michelle Manning and Serafinowicz, said that even though he declined Knapp's repeated offers to soap the boy's back while the two were alone in the shower area, Knapp did it on one occasion anyway and touched the top of the boy's buttocks. The boy said that although it made him uncomfortable, he soaped Knapp's back on several occasions because he did not want Knapp, his swimming coach, angry with him.

At the time, the youth was being privately coached by Knapp while he was on the club's Barracuda Swim Team.

The boy's father also testified Monday that his son have him the same account more than four years earlier, which caused him to call Greenwich police and file a complaint against Knapp.

Knapp, 31, of the Riverside section of town, is charged with two felony counts of risk of injury to a minor and fourth-degree sexual assault.

After taking the unusual move just before lunch Wednesday of calling Knapp to the stand, Serafinowicz asked him if he ever walked into the boy's shower stall, or asked the youngster to soap his back, or ever touched him. Knapp replied "no" to each question.

Knapp said he showered with his bathing suit on and never exposed himself, and was always dressed, except when he was pulling on his briefs.

Closing arguments were scheduled for Wednesday afternoon. Following Hudock's instructions to the jury, deliberations are set to begin sometime late Thursday morning.

When it came to the cross-examination, Manning zeroed in on an allegation against Knapp from a school where he worked before being hired by Greenwich. Knapp's warrant from four years ago mentioned an alleged history of inappropriate behavior toward another young male at the Grove School in Madison. The FBI investigated the relationship, which was reported by the boy's mother, but the case was closed without an arrest.

Manning asked if on his resume and his application for employment with Greenwich Public Schools, Knapp omitted he worked for the Grove School. Serafinowtz objected, saying the question was unduly prejudicial.

After discussing the objection with the jury out of the room, Judge Bruce Hudock said he would allow Manning to ask the question, but not allow her to get into the specifics of the Grove School allegations, about which the jury apparently has no information.

With the jury back in the courtroom, Manning asked Knapp if he left out his Grove School employment history on his Greenwich application, and Knapp admitted that he had.

Manning then asked Knapp whether he offered two different accounts at the time of the investigation and his arrest about what happened with the youth in the locker room. Knapp said he was flustered before going to speak to Greenwich investigators and police tried to make him even more flustered during their interview. But Knapp denied providing a second story about the incidents.